package com.zyx.nettypro.netty.heartbeat;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.timeout.IdleStateHandler;

import java.util.concurrent.TimeUnit;

/**
 * @author Yaxi.Zhang
 * @since 2021/9/23 13:47
 */
public class MyServer {
    public static void main(String[] args) {
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try {
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(workerGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline pipeline = ch.pipeline();
                            /*
                                加入一个netty 提供 IdleStateHandler
                                说明: IdleStateHandler 是netty 提供的处理空闲状态的处理器
                                参数
                                    long readerIdleTime : 表示多长时间没有读, 就会发送一个心跳检测包检测是否连接
                                    long writerIdleTime : 表示多长时间没有写, 就会发送一个心跳检测包检测是否连接
                                    long allIdleTime : 表示多长时间没有读写, 就会发送一个心跳检测包检测是否连接
                                文档说明
                                    triggers an {@link IdleStateEvent} when a {@link Channel} has not performed read, write, or both operation for a while.
                                    当 IdleStateEvent 触发后, 就会传递给管道 的下一个handler去处理
                                    通过调用(触发)下一个handler 的 userEventTiggered,  在该方法中去处理 IdleStateEvent(读空闲，写空闲，读写空闲)
                             */
                            pipeline.addLast(new IdleStateHandler(3L, 5L, 7L, TimeUnit.SECONDS));
                            pipeline.addLast(new MyServerHandler());
                        }
                    });
            ChannelFuture cf = bootstrap.bind(7000).sync();
            cf.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}
